Hello,
Thank you for posting in Microsoft Community forum.
Based on the description, I understand your question is related to patch.
I checked the August update website but do not find similar issue published, but it is recommended to uninstall that update and monitor if issue disappears. Also, monitor Microsoft update website to check if there is further information.
You can check the Group Policy settings for default browser. You can set the default browser using Group Policy Preferences.
Navigate to User Configuration -> Preferences -> Control Panel Settings -> Internet Settings
Create a new Internet Explorer 10 setting. In the “Common” tab, check “Remove this item when it is no longer applied” and use item-level targeting to apply it only to the specific users or groups.
Have a nice day.
Best Regards,
Molly